Engine warming up: The coolant temperature sensor sends information to the control unit about the increasing heating of the coolant. The control unit issues a command to close the idle stabilization valve, and the injection duration returns to the standard level.
Idling: Based on the information received from the throttle potentiometer and the fresh air flow meter, the control unit knows when the engine is idling. If the speed drops, then the control unit changes the ignition timing; at the same time, the throttle control unit increases the air flow, resulting in a slight increase in the amount of fuel injected.
Standard operation does not require any special equipment. The position of the throttle valve and the amount of air passing through its meter determine the duration of the opening of the injection valves.
Accelerations: fast opening of the throttle valve is recognized by the control unit as an acceleration signal from the throttle potentiometer.
Adjustment via lambda probe: The catalytic converter requires a constant change between a slightly rich and a slightly lean air-fuel mixture for the correct operation of the catalytic converter. Information about the content of residual oxygen in the exhaust at the moment lambda probe (in a catalytic converter) transmits to the control unit, which in a fraction of a second gives the order to the injectors to lengthen or shorten the injection time and, consequently, the flow of gasoline.
Traction shutdown: the information that the foot is off the gas pedal is fed back to the control unit through the throttle valve potentiometer in its control unit. If at the same time the coolant temperature sensor signals that the engine has reached the operational warm-up, and the Hall sensor in the distributor sends information that the engine speed has exceeded 1500 rpm, the control unit no longer orders the injectors to open.
Full load: At full load with the throttle fully depressed, the engine needs more fuel. signal based «full throttle», received from the throttle potentiometer in combination with the corresponding signal from the fresh air flow meter, the control unit recognizes the condition «full throttle» and causes the injectors to inject longer.
Speed limit: The control unit disables the injectors to protect the engine from overspeed if it exceeds 6500 rpm (engine with a displacement of 1.6 liters) or 6800 rpm (engine with a displacement of 1.8 liters).
Emergency running function: if one of the sensors does not receive information or senseless information comes, Motronic is not yet out of order. The control unit selects the so-called auxiliary value, which is in the database.
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